Which unity version should i download for macosx el capitan (10.11.6) ? ,which unity version should i download for el capitan ?

Hey

I have gone through many reviews, but it’s still unclear to me as in to which unity version i should download into this machine.

I am only a beginner at this. And my future plans is to simulate engineering designs etc.

But for now, I doubt this mac can handle the work considering the GPU and all, but even to just get it start working would be good.

Please help me out ! ,